<?php
class Response
{
	private $headers = array();

	private $level = 0;

	private $output;

	public function addHeader($header)
	{
		$this->headers[] = $header;
	}

	public function redirect($url)
	{
		header('Location: ' . $url);
		exit;
	}

	public function setCompression($level)
	{
		$this->level = $level;
	}

	public function setOutput($output)
	{
		$this->output = $output;
	}

	public function &render()
	{
		return $this->output;
	}

	private function compress($data, $level = 0)
	{
		if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && (strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== false))
		{
			$encoding = 'gzip';
		}

		if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && (strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'x-gzip') !== false))
		{
			$encoding = 'x-gzip';
		}

		if (!isset($encoding))
		{
			return $data;
		}
		if (!extension_loaded('zlib') || ini_get('zlib.output_compression'))
		{
			return $data;
		}
		if (headers_sent())
		{
			return $data;
		}
		if (connection_status())
		{
			return $data;
		}

		$this->addHeader('Content-Encoding: ' . $encoding);

		return gzencode($data, (int)$level);
	}

	public function output()
	{
		if ($this->output)
		{
			if ($this->level)
			{
				$ouput = $this->compress($this->output, $this->level);
			}
			else
			{
				$ouput = $this->output;
			}

			if (!headers_sent())
			{
				foreach ($this->headers as $header)
				{
					header($header, true);
				}
			}

			echo $ouput;
		}
	}
}

?>